// Written in the D Programming Language
/*
 * Copyright (c) 2008 OpenGLUtils
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'OpenGLUtils' nor the names of its contributors 
 *   may be used to endorse or promote products derived from this software 
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
module openglutils.GLVersion;

import derelict.opengl.gl;
import derelict.util.exception;
import openglutils.GLException;

/**
 * Gets the current running OpenGL implementation's version.
 * 
 * Returns: A GLVersion telling which version of the OpenGL implementation the application is running on.
 */
public GLVersion getGLVersion()
{
	GLVersion glv;
	try
	{
		glv = DerelictGL.availableVersion();
	}
	catch(SharedLibProcLoadException slple)
	{
		throw new GLException("Could not get the OpenGL version.");
	}
	return glv;
}

/**
 * Gets the current running OpenGL implementation's version.
 * 
 * Returns: A string telling which version of the OpenGL implementation the application is running on.
 */
public char[] getVersion()
{
	switch(getGLVersion())
	{
		case GLVersion.Version11:
			return "OpenGL version: 1.1";
		case GLVersion.Version12:
			return "OpenGL version: 1.2";
		case GLVersion.Version13:
			return "OpenGL version: 1.3";
		case GLVersion.Version14:
			return "OpenGL version: 1.4";
		case GLVersion.Version15:
			return "OpenGL version: 1.5";
		case GLVersion.Version20:
			return "OpenGL version: 2.0";
		case GLVersion.Version21:
			return "OpenGL version: 2.1";
		default:
			return "OpenGL version: Unknown";
	}
}
